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How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
histogram displays the bins as rectangles such that the height of each rectangle indicates the number of elements in the bin. example histogram(X,nbins) uses a number of bins specified by the scalar, nbins. histogram(X,edges) sorts X into bins with the bin edges specified by the vector, edges. Each bin includes the left edge, but does not include the right edge, except for the last bin which includes both edges.